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| author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2018-04-04 16:11:49 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2018-04-04 16:11:49 -0700 |
| commit | 664b0bae0b87f69bc9deb098f5e0158b9cf18e04 (patch) | |
| tree | d5841492b396ff483723b9339c7c11dc33b67688 /kernel/trace/trace_stack.c | |
| parent | 567b9b549cfa1cbc202762ae97b5385c29ade1e3 (diff) | |
| parent | 04bb1719c4de94700056241d4c0fe3c1413f5aff (diff) | |
Merge branch 'next' into for-linus
Prepare input updates for 4.17 merge window.
Diffstat (limited to 'kernel/trace/trace_stack.c')
| -rw-r--r-- | kernel/trace/trace_stack.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c index 719a52a4064a..3c7bfc4bf5e9 100644 --- a/kernel/trace/trace_stack.c +++ b/kernel/trace/trace_stack.c @@ -78,7 +78,7 @@ check_stack(unsigned long ip, unsigned long *stack) { unsigned long this_size, flags; unsigned long *p, *top, *start; static int tracer_frame; - int frame_size = ACCESS_ONCE(tracer_frame); + int frame_size = READ_ONCE(tracer_frame); int i, x; this_size = ((unsigned long)stack) & (THREAD_SIZE-1); @@ -209,6 +209,10 @@ stack_trace_call(unsigned long ip, unsigned long parent_ip, if (__this_cpu_read(disable_stack_tracer) != 1) goto out; + /* If rcu is not watching, then save stack trace can fail */ + if (!rcu_is_watching()) + goto out; + ip += MCOUNT_INSN_SIZE; check_stack(ip, &stack); |